Advanced Monolithic Systems

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1 Advanced Monolithic Systems FEATURES Three Terminal Adjustable or Fixed oltages* 1.5, 1.8, 2.5, 2.85, 3.3 and 5. Output Current of 1A Operates Down to 1 Dropout Line Regulation:.2% Max. Load Regulation:.4% Max. SOT-223, TO-252 and SO-8 package available 1A LOW DROPOUT OLTAGE REGULATOR RoHs Compliant APPLICATIONS High Efficiency Linear Regulators Post Regulators for Switching Supplies 5 to 3.3 Linear Regulator Battery Chargers Active SCSI Terminators Power Management for Notebook Battery Powered Instrumentation GENERAL DESCRIPTION The series of adjustable and fixed voltage regulators are designed to provide up to1a output current and to operate down to 1 input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.3, decreasing at lower load currents. On-chip trimming adjusts the reference voltage to 1.5%. Current limit is set to minimize the stress under overload conditions on both the regulator and power source circuitry. The devices are pin compatible with other three-terminal SCSI regulators and are offered in the low profile surface mount SOT-223 package, in the 8L SOIC package and in the TO-252 (DPAK) plastic package. ORDERING INFORMATION: PACKAGE TYPE OPERATING JUNCTION TO-252 SOT-223 8L SOIC TEMPERATURE RANGE CD CS -4 to 125 C CD CS to 125 C CD CS to 125 C CD CS to 125 C CD CS to 125 C CD CS to 125 C CD CS to 125 C *For additional available fixed voltages contact factory. PIN CONNECTIONS SOT-223 Top iew GND/ADJ OUT 1 2 OUT 3 IN 4 8L SOIC Top iew 8 N/C 7 OUT OUT 5 N/C 3 PIN FIXED/ADJUSTABLE ERSION 1- Ground/Adjust 2- OUT 3- IN TAB IS OUTPUT TO-252 FRONT IEW 3 2 1

2 ABSOLUTE MAXIMUM RATINGS (Note 1) Power Dissipation Internally limited Soldering information Input oltage 15 Lead Temperature (25 sec) 25 C Operating Junction Temperature Range Thermal Resistance Control Section -4 C to 125 C SO-8 package ϕ JA = C/W Power Transistor -4 C to 125 C TO-252 package ϕ JA = 8 C/W Storage temperature - 5 C to +15 C SOT-223 package ϕ JA = 9 C/W* * With package soldering to copper area over backside ground plane or internal power plane ϕ JA can vary from 4 C/W to >9 C/W depending on mounting technique and the size of the copper area. ELECTRICAL CHARACTERISTICS Electrical Characteristics at I OUT = ma, and T J = +25 C unless otherwise specified. Parameter Device Conditions Min Typ Max Units Reference oltage (Note 2) Output oltage (Note 2) I OUT = ma 1.5 ( IN - OUT) IN = IN = IN = IN = IN = IN = Line Regulation 1.5 ( IN - OUT) ( IN - OUT) ( IN - OUT) ( IN - OUT) ( IN - OUT) ( IN - OUT) ( IN - OUT) % % Load Regulation (Notes 2, 3) ( IN - OUT) =1.5, ma I OUT.8A % % -1.5 IN = 3, I OUT.8A IN = 3.3, I OUT.8A IN = 5, I OUT.8A 3 12

3 ELECTRICAL CHARACTERISTICS Electrical Characteristics at I OUT = ma, and T J = +25 C unless otherwise specified. Parameter Device Conditions Min Typ Max Units Load Regulation (Notes 2, 3) IN = 4.35, I OUT.8A IN = 4.75, I OUT.8A IN =.5, I OUT.8A 5 35 Dropout oltage ( IN - OUT ) Current Limit -1.5/-1.8/-2.5/- 2.85/-3.3/ /-1.8/-2.5/- 2.85/-3.3/-5. OUT, REF = 1%, I OUT =.8A (Note 4) ( IN - OUT) = , 1,5 ma Minimum Load Current Quiescent Current ( IN - OUT) = 1.5 (Note 5) 5 ma -1.5/-1.8/-2.5/- 2.85/-3.3/-5. ( IN - OUT) = ma Ripple Rejection f =1Hz, C OUT = 22µF Tantalum, I OUT = 1A, ( IN- OUT ) = 3, C ADJ =µf 75 db -1.5/-1.8/-2.5/ f =1Hz, C OUT = 22µF Tantalum, I OUT = 1A, IN = 4.35 f =1Hz, C OUT = 22µF Tantalum, I OUT = 1A IN = 4.75 f =1Hz, C OUT = 22µF Tantalum, I OUT = 1A IN =.5 72 db 72 db 8 db Thermal Regulation T A = 25 C, 3ms pulse.8.4 %W Adjust Pin Current I OUT =ma, 1.5 ( IN - OUT) µa µa Adjust Pin Current Change I OUT =ma, 1.5 ( IN - OUT) µa Temperature Stability.5 % Long Term Stability T A =125 C, Hrs.3 1 % RMS Output Noise (% of OUT ) Thermal Resistance Junction-to-Case T A = 25 C, Hz f khz.3 % All packages 15 C/W Parameters identified with boldface type apply over the full operating temperature range. Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Note 2: Line and Load regulation are guaranteed up to the maximum power dissipation of 1.2 W for SOT-223, 2.2W for TO-252 and 78mW for 8-Lead SOIC. Power dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range. Note 3: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead ~1/8 from the package. Note 4: Dropout voltage is specified up to.8a load. For currents over.8a dropout will be higher Note 5: Minimum load current is defined as the minimum output current required to maintain regulation. When 1.5 ( IN - OUT) 12 the device is guaranteed to regulate if the output current is greater than ma.

4 APPLICATION HINTS The series of adjustable and fixed regulators are easy to use and are protected against short circuit and thermal overloads. Thermal protection circuitry will shut-down the regulator should the junction temperature exceed 15 C at the sense point. Pin compatible with older three terminal adjustable regulators, these devices offer the advantage of a lower dropout voltage, more precise reference tolerance and improved reference stability with temperature. IN D1 IN OUT ADJ + C OUT R 1 22µF OUT Stability The circuit design used in the series requires the use of an output capacitor as part of the device frequency compensation. The addition of 22µF solid tantalum on the output will ensure stability for all operating conditions. When the adjustment terminal is bypassed with a capacitor to improve the ripple rejection, the requirement for an output capacitor increases. The value of 22µF tantalum covers all cases of bypassing the adjustment terminal. Without bypassing the adjustment terminal smaller capacitors can be used with equally good results. To further improve stability and transient response of these devices larger values of output capacitor can be used. Protection Diodes Unlike older regulators, the family does not need any protection diodes between the adjustment pin and the output and from the output to the input to prevent over-stressing the die. Internal resistors are limiting the internal current paths on the adjustment pin, therefore even with capacitors on the adjustment pin no protection diode is needed to ensure device safety under short-circuit conditions. Diodes between the input and output are not usually needed. Microsecond surge currents of 5A to A can be handled by the internal diode between the input and output pins of the device. In normal operations it is difficult to get those values of surge currents even with the use of large output capacitances. If high value output capacitors are used, such as µf to 5µF and the input pin is instantaneously shorted to ground, damage can occur. A diode from output to input is recommended, when a crowbar circuit at the input of the is used (Figure 1). Output oltage C ADJ µf Ĥigure 1. The series develops a 1.25 reference voltage between the output and the adjust terminal. Placing a resistor between these two terminals causes a constant current to flow through R1 and down through R2 to set the overall output voltage. This current is normally the specified minimum load current of ma. Because I ADJ is very small and constant it represents a small error and it can usually be ignored. IN Load Regulation IN OUT ADJ I ADJ 5µA R 2 REF OUT = REF (1+ R2/R1)+I ADJ R2 R1 R2 Figure 2. Basic Adjustable Regulator OUT True remote load sensing it is not possible to provide, because the is a three terminal device. The resistance of the wire connecting the regulator to the load will limit the load regulation. The data sheet specification for load regulation is measured at the bottom of the package. Negative side sensing is a true Kelvin connection, with the bottom of the output divider returned to the negative side of the load. The best load regulation is obtained when the top of the resistor divider R1 is connected directly to the case not to the load. If R1 were connected to the load, the effective resistance between the regulator and the load would be: R P x ( R2+R1 ), R1 R P = Parasitic Line Resistance

5 APPLICATION HINTS Connected as shown, R P is not multiplied by the divider ratio IN IN OUT ADJ *CONNECT R1 TO CASE CONNECT R2 TO LOAD R P PARASITIC LINE RESISTANCE R1* R2* Figure 3. Connections for Best Load Regulation In the case of fixed voltage devices the top of R1 is connected Kelvin internally, and the ground pin can be used for negative side sensing. Thermal Considerations The series have internal power and thermal limiting circuitry designed to protect the device under overload conditions. However maximum junction temperature ratings of 125 C should not be exceeded under continuous normal load conditions. Careful consideration must be given to all sources of thermal resistance from junction to ambient. For the surface mount package SOT-223 additional heat sources mounted near the device must be considered. The heat dissipation capability of the PC board and its copper traces is used as a heat sink for the device. The thermal resistance from the junction to the tab for the is 15 C/W. Thermal resistance from tab to ambient can be as low as 3 C/W. R L The total thermal resistance from junction to ambient can be as low as 45 C/W. This requires a reasonable sized PC board with at least on layer of copper to spread the heat across the board and couple it into the surrounding air. Experiments have shown that the heat spreading copper layer does not need to be electrically connected to the tab of the device. The PC material can be very effective at transmitting heat between the pad area, attached to the pad of the device, and a ground plane layer either inside or on the opposite side of the board. Although the actual thermal resistance of the PC material is high, the Length/Area ratio of the thermal resistance between layers is small. The data in Table 1, was taken using 1/1 FR-4 board with 1 oz. copper foil, and it can be used as a rough guideline for estimating thermal resistance. For each application the thermal resistance will be affected by thermal interactions with other components on the board. To determine the actual value some experimentation will be necessary. The power dissipation of the is equal to: P D = ( IN - OUT )( I OUT ) Maximum junction temperature will be equal to: T J = T A(MAX) + P D (Thermal Resistance (junction-to-ambient)) Maximum junction temperature must not exceed 125 C. Ripple Rejection The ripple rejection values are measured with the adjustment pin bypassed. The impedance of the adjust pin capacitor at the ripple frequency should be less than the value of R1 (normally Ω to Ω) for a proper bypassing and ripple rejection approaching the values shown. The size of the required adjust pin capacitor is a function of the input ripple frequency. If R1=Ω at 1Hz the adjust pin capacitor should be >13µF. At khz only.1µf is needed. The ripple rejection will be a function of output voltage, in circuits without an adjust pin bypass capacitor. The output ripple will increase directly as a ratio of the output voltage to the reference voltage ( OUT / REF ). Table 1. COPPER AREA THERMAL RESISTANCE TOP SIDE* BACK SIDE BOARD AREA (JUNCTION-TO-AMBIENT) 25 Sq. mm 25 Sq. mm 25 Sq. mm 55 C/W Sq. mm 25 Sq. mm 25 Sq. mm 55 C/W 225 Sq. mm 25 Sq. mm 25 Sq. mm 5 C/W Sq. mm 25 Sq. mm 25 Sq. mm 8 C/W Sq. mm Sq. mm Sq. mm C/W Sq. mm Sq. mm 5 C/W * Tab of device attached to topside copper.

6 TYPICAL PERFORMANCE CHARACTERISTICS 12 Minimum Operating Current (Adjustable Device) 1.25 Short-Circuit Current MINIMUM OPERATING CURRENT (ma) 9 3 T J = 125 C T J = 25 C SHORT CIRCUIT CURRENT (A) T J = 125 C T J = 25 C INPUT/OUTPUT DIFFERENTIAL () INPUT/OUTPUT DIFFERENTIAL OUTPUT OLTAGE DEIATION (%) Load Regulation I LOAD = 1A TEMPERATURE ( C) RIPPLE REJECTION (db) Ripple Rejection vs. Current RIPPLE 3p-p RIPPLE.5p-p OUT = 5 C ADJ = 25µF C OUT = 25µF OUTPUT CURRENT (A) f RIPPLE = 1Hz f RIPPLE = Hz 2. Temperature Stability Adjust Pin Current 9 OUTPUT OLTAGE CHANGE (%) ADJUST PIN CURRENT (µa) TEMPERATURE ( C) TEMPERATURE ( C)

7 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted. TO-252 PLASTIC PACKAGE (D) ( ) ( ) ( ) (.4-.58) ( ) ( ) ( ).25 (.35) TYP ( ).3 (.72) TYP.45-. ( ) ( ).±.2 (.5±.58) (.4-.58) D (D3) AMS DRW# 11 3 LEAD SOT-223 PLASTIC PACKAGE (.3-.71) ( ) ( ) ( ).9 (2.29) NOM ( ).71 (1.8) MAX MAX (.25-.3) (.4-.84).181 (4.) NOM.12 (.31) MIN (.4-.84) -1 (SOT-223 ) AMS DRW# 42292

8 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued). 8 LEAD SOIC PLASTIC PACKAGE (S) * ( ) ( ) ** ( ) ( ).4-. ( ).8-. ( ).-. ( ) x 45-8 TYP ( ).5 (1.27) TYP.1-.5 ( ) S (SO-8 ) AMS DRW# *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED." (.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED." (.254mm) PER SIDE

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